Die stock



Oct. 27, 1936.

w. A. PHILLIS I 2,058,909

I m W /00 i 3 96 7/ 95 /Z C177 F:

Oct. 27, 1936. w. A. PHILLIS DIE STOCK Filed Dec. '24, 1954 3 Sheets-Sheet 2 5e 55 Z5 Z0 50 0 3 xe a w Z i w 4 #4 N I" E 0 z 5 5 3 7 z w z 7 4 3 0 0 43 v 7 f 0 0 W FIN 00 w -ufi a 4, 6 |1 w m l 0 3 5 m 8 Patented Oct. 27, 1936 UNITED STATES PATENT' OFFICE DIE. STOCK William A. Phillis, Warren, Ohio, assignor to Beaver Pipe Tools, Inc., Warren, Ohio, a corporation of Ohio This invention relates to a ratchet die stock of the non-receding type but with the chasers settable for different sizes of pipe to be threaded. The die stock also has a pipe guide settable for 5 difierent sizes of pipe.

The primary object of the invention is to provide such a type of die stock in a form which, while being readily settable both as to the chasers and the guide, shall be Very pompact and com- 10 paratively small and light and very readily operated. In my die stock the ratchet drive operates on the chaser-carrying head itself, to make a very direct transmission of force. Simple means are provided for clamping the cam plate 15 which sets the chasers and for holding the guide in its set position. Altogether I have provided a tool which is very efficient and well adapted for the work intended, and which may be very readily' set for a comparatively large range of pipe 20 sizes considering the size of the tool.

My invention is illustrated in the drawings hereof and is hereinafter more fully described and the essential novel features are summarized in the claims.

25 In the drawings, Fig. 1 is a face view of the die stock, being a plan of the tool as it might stand on a bench; Figs. 2 and 3 are diametric sections of the die stock in the planes indicated by the correspondingly numbered lines on Fig. 1; Fig. 4

30 is a bottom plane of the cam plate for setting the chasers, showing the chasers in position against such plate, this view being a section on the line 4 l on Fig. 3 looking upwardly; Fig. 5 is a view of the work holder of the die stock, being 35 a section on the line 5-5 on Fig. 3 looking downwardly; Figs. 6 and 7 are respectively a top perspective and a bottom perspective of the main frame of the die stock; Fig. 8 is a perspective of a friction spring employed in the pipe guide; Fig. 9

. is a perspective of a pawl forming part of the ratchet-driving mechanism.

My die stock is built around a peculiarly constructed main frame which has notches in which the chasers and the work holder blocks are 45 slidable, under the control of cams mounted on the frame. The frame also has an intermediately located zone of external teeth which are engaged by the ratchet drive mechanism, movably mounted on the frame. Thus, simplicity and 5 great compactness is obtained. This main frame, as shown in Figs. 2, 3, 6, and '7, is a single integral casting of suitable metal, preferably steel. It is convenient, however, to refer to this frame as comprising various parts which will not 55 be described,

The main parts of the frame comprise a solid annular body portion Ill, and a segmented inner sleeve II, a segmented outer sleeve l2, which rises from an external flange portion [3, and various radial ribs l4 connecting the sleeves, the sleeves and ribs all extending integrally from the body portion l0. The die stock preferably has eight chasers, four of which are used for two sizes of pipe and the other four for two other sizes. In this case the inner sleeve H is 10 formed with eight radial notches l5 and the outer sleeve with eight corresponding notches I6, the notches in the two sleeves radially aligning. Each notch has parallel vertical walls and a horizontal bottom surface, as I! and l8using the terms vertical" and horizontal with reference to the die stock when standing on a bench with the chaser cam uppermost, as in Figs. 1 and 6. The width of the various notches is commensurate with the width of the chasers which have an easy sliding. fit in the notches and the depth of the notches 16 corresponds to the height of the chasers.

The chasers are in two sets, indicated by A and B, each comprising four chasers. The chasers of the B set are slightly longer than those of the A set and their actuating pins are differently positioned, but otherwise all the chasers are alike. Each comprises a block 30, rectangular in cross-section, provided with teeth 3| at its inner edge with its outer edge bevelled as at 32. Projecting from the upper face is an operating pin 33 rigid with the chaser, preferably being driven into a hole therein.

The chaser operating cam, designated 40, is a 35 fiat ring having a central circular opening which snugly but slidably embraces a reduced portion 20 of the segmented sleeve ll. On the underside of the cam ring are four cam grooves 4|, each of which cooperates with the two pins 33 of adjacent A and B chasers, as shown in Fig. 4. The cam overlies the top surface 22 of the outer segment l2 between the chasers and overlies ledges 23 formed on the segment I I between the chasers at the lower end of the reduced portion 20. The chasers are preferably slightly higher than the surfaces 22 and 23, so that the cam plate rests on the chasers themselves to clamp them more effectively when the plate is clamped, as hereinafter explained; but the coaction of the cam plate with the segments I2 is so close that dirt or fine chips cannot work in between them.

The cam plate 40 is held on the frame by a ring nut 50, which screws onto threads 25 on the reduced frame extension 20, and preferably has diametric lugs 5I by which it may be readily turned. In the top face of the nut is a recess in which normally seats a washer 55 extending into space between two adjacent segments of the extension 20 and held by a screw 56. This construction locks the ring nut in place, but by loosening the screw and raising the washer the position of the ring may be adjusted to allow just the right clearance for the cam plate, the ,ring being lockable in any one of eight positions by reason of the eight chaser notches into which the locking washer 55 may extend. The ring is adjusted so that the cam plate is reasonably tight, but may be readily turned by means of a handle extending radially from the plate.

Other integral portions of the frame comprise two upstanding diametrically positioned bosses 20 and 21. The boss 26 has a U-shaped recess 28 in its upper surface and has set into it an upstanding threaded stud 20. A small clamping block 60 occupies the recess 28 and has a bevelled inner edge 6| bearing against a bevelled outer edge 47 in the cam plate. A ring nut 65 screws onto the stud 29 and thus forces the block 60 into clamping engagement with the cam plate to hold it in any selected position. The cam plate has suitable graduations 48 on its upper surface which cooperate with suitable marks 49 on the smooth upper surface of the boss 21 to readily indicate the setting of the chasers.

It will be understood from the description given that a slight loosening of the ring nut 65 will allow the cam lever 45 to set the chasers for any size of pipe within the range of the die stock, as indicated by the cooperating marks 48 and 49. Thus, in the particular embodiment illustrated the cam plate may position the chasers of the A set for one-half or three-fourths of an inch pipes and those of the B set for three-eighths or one-fourth inch. Or in a larger embodiment of the same mechanism, the chasers of the A set could be for one and one-half inch and two-inch pipes and those of the B set for one and onequarter and one-inch pipes.

Attention is called to the radial ribs I4 which at their ends are connected with the inner and outer segments and at their bottoms with the main body I0 of the frame, which here has a substantially flat top face I9. The inner sleeve segments which primarily receive the circumferential thrust on the chasers due to the cutting stresses are thus thoroughly braced and accordingly may be comparatively small and still have effective rigidity. One of the radial ribs designated I4a in Fig. 6 is larger than any of the others and is made with a radial opening I4b extending from outside the die stock to the interior. This provides ready means for conducting oil to the cutting edges of the chasers.

The pipe guide is mounted on the other end of the main frame; that is to say, as shown in Fig. 7, the fiat end 10 of the body portion I0 is formed with three radial notches II between which the casting is cored out at l2 for lightness. Between the notches at the inner periphery are three concentric arcuate ribs 74. Slidably mounted in the three notches 'II are rectangular blocks 80, each of which has a projecting pin 8| adapted to occupy a corresponding cam groove 82 (Fig. 5) in a cam ring 83 which rotatably embraces the arcuate ribs 12 and is provided with a handle 85 by which it may be turned.

The guide cam 83 is shown as held in place against inadvertent displacement by an arcuate leaf spring 86 (Figs. 2, 3, and 8) Which makes nearly a complete circle and is mounted in an annular groove 81 in a retaining plate 08, secured to the frame by screws 89. The spring is made of a wavy form to bear alternately against the cam plate 83 and the retaining plate 88, and accordingly it supplies sufficient friction to hold the cam plate wherever it may be placed. While any suitable arrangement of cam operated guide blocks may be used, the construction shown is very effective in enabling the guide to be immediately positioned in proper snugness to the pipe and hold its position, as there is not suflicient circumferential component of the outward thrust on the blocks todisplace the friction-held cam.

The main body I0 of the frame between the pipe-guide cam and the flange I 3 is externally cylindrical, as shown at 90 in Fig. '7, except that it is provided with a set of equally spaced radially faced teeth 9|. Rotatably surrounding the teeth 9| is a circular strap I00 which bears at one edge against the smooth annular face of the frame flange I3, and is retained in this position by a ring 95 which is held in place by suitable screws (of which one is shown at 96 in Fig. 2) threading into some of the teeth 9|. The strap I00 has a socket for an operating handle and carries a ratchet pawl to coact with the teeth, whereby the oscillation of the handle may periodically turn the frame chasers and pipe guide to effect the threading.

The handle socket is formed integrally with the strap I00, as shown at ml in Fig. l, and is internally threaded to receive a usual handle I02. A short distance from the handle socket IOI is a smaller sleeve I05 also integral with the strap, the sleeve I05 being preferably braced to the handle sleeve I 0| by an intervening web I01. The sleeve I05 has a cylindrical bore and within it is slidably mounted a cylindrical pawl H0, which adjacent its inner end is cut away to leave a flat face III (Fig. 9) parallel with the axis, while the remaining semi-cylindrical portion is bevelled as shown at H2. The pawl has an outwardly extending shank I I3, which passes loosely through a plug II4 threaded in the sleeve. A spring I I5 .is compressed between the plug and pawl and thus presses it inward radially, normally into the space between adjacent frame-teeth 9I Accordingly, the handle I02 is given a ratchet connection to the frame to feed it in one direction or the other, depending on the direction in which the driving surface of the pawl faces.

I have shown in Fig. 3 convenient means for reversing the pawl or holding it idle, though the same is not per se part of my invention. As there shown, the threaded. outer end of the pawl shank H3 carries a nut I20 which bears against a washer I2I, on the inner side of which are washers I22 with radial lugs I23. All of these washers are tight on the shank. A pair of diametric notches is made in the end of the sleeve I05 and is adapted to be occupied by these lugs when the pawl is in its innermost position. This construction enables the pawl to be readily faced in either direction or held in neutral position, as desired. When in either normal position the lugs I23 occupy notches in the end of the sleeve I05 to prevent the pawl rotating, so that it may effectively engage radial faces of the frame teeth 9| when the handle I02 is moved in one direction, or to ride back idly over those teeth when the handle is moved in the opposite direction. By grasping the washer I2I, which overhangs the sleeve I 05, and pulling the pawl radially outward and giving it a half-rotation, it may be returned faced in the opposite direction, or a quarter turn will cause the lugs I23 to engage the extreme end of the sleeve I05 and thus hold the pawl in idle position.

It will be apparent from the description heretofore given that my die stock may be set with a minimum of adjustment; the loosening of the wing nut 65 and the shifting of the cam lever with the subsequent tightening of the wing nut sets the chasers for the size of pipe desired. The guide blocks being spread by the operation of the cam lever 85, the die stock may be put on the pipe and the blocks returned to give the desired snug engagement for guiding the die stock. Then (if the pawl is properly set) the mere forward and backward movement of the handle rotates the frame to effect the threading. At the end of the operation the mere reversal of the pawl enables the same movement of the handle to screw the die stock off of the thread cut.

I claim:

1. In a die stock, the combination of a frame having inner and outer sleeve portions separated into segments by radial notches, the body of the frame connecting said segments beyond the bottom of the notches, webs connecting the segments between the notches, chasers in the notches and between the side walls of adjacent webs, a bossrigidly formed on the outer side of the frame, a screw carried by the boss, a nut on the screw, a cam plate overlying the chasers and connected therewith and having a bearing in an axial direction on the inner sleeve and substantially coacting with the face of the outer sleeve segments, and a block mounted on the screw and adapted to be pressed against the cam plate by a nut on the screw.

2. In a die stock, the combination of a frame having inner and outer sleeve portions divided by notches into segments, and a body portion connecting the base of the segments, transverse webs connecting the segments and body portion between the notches and so spaced that the webs and notches alternate around the stock, extensions of the inner segments above the notches to provide a threaded interrupted ring of less diameter than the exterior of the inner sleeve at the webs, whereby ledges are provided at the inner ends of the webs, a cam plate substantially coacting with the faces of the segments of the outer ring and with the said ledges, chasers occupying the notches between the segments and lying between the side walls of the adjacent notches and coacting with the cam plate, means for clamping the cam plate in position, and means for rotating the die stock frame.

3. In a die stock, the combination of a frame comprising an annular body having a substantial- 1y cylindrical portion carrying teeth on its exterior, an outward flange portion at one end of the teeth, inner and outer rings on the other side of said flange portion, each of said rings being divided by chaser notches into a group of arouate segments, radial webs each connected at one end with the central region of an outer segment and at the other end with the central region of an inner segment, the outer segmental ring forming the outer wall of the die stock, a cam plate overlying the webs and said outer wall and adapted to coact on its underside with chasers in said notches, and a ring embracing said teeth and carrying a pawl to coact therewith.

WILLIAM A. PHILLIS. 

